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| Titel |
Correlation between equatorial Kelvin waves and the occurrence of extremely thin ice clouds at the tropical tropopause |
| VerfasserIn |
F. Immler, K. Krüger, M. Fujiwara, G. Verver, M. Rex, O. Schrems |
| Medientyp |
Artikel
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| Sprache |
Englisch
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| ISSN |
1680-7316
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| Digitales Dokument |
URL |
| Erschienen |
In: Atmospheric Chemistry and Physics ; 8, no. 14 ; Nr. 8, no. 14 (2008-07-25), S.4019-4026 |
| Datensatznummer |
250006302
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| Publikation (Nr.) |
 copernicus.org/acp-8-4019-2008.pdf |
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| Zusammenfassung |
| A number of field-campaigns in the tropics have been conducted in recent
years with two different LIDAR systems at Paramaribo (5.8° N,
55.2° W), Suriname. The lidars detect particles in the atmosphere with
high vertical and temporal resolution and are capable of detecting extremely
thin cloud layers which frequently occur in the tropical tropopause layer
(TTL). Radiosonde as well as operational ECMWF analysis showed that
equatorial Kelvin waves propagated in the TTL and greatly modulated its
temperature structure. We found a clear correlation between the temperature
anomalies introduced by these waves and the occurrence of thin cirrus in the
TTL. In particular we found that extremely thin ice clouds form regularly
where cold anomalies shift the tropopause to high altitudes. These findings
suggest an influence of Kelvin wave activity on the dehydration in the TTL
and thus on the global stratospheric water vapour concentration. |
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